患者男，25岁，在外地务工，于回家探亲的火车上突然起病，紧张、恐惧，大吵大闹，认为有人要害他，由家人陪同到门诊就医。既往无精神病史。查体：呈轻度脱水貌，其他无异常。精神检查：意识清晰，有被害观念。

此患者最有可能的诊断（）

A.偏执状态 

B.精神分裂症 

C.急性心因性反应 

D.旅途性精神病 

E.躁狂发作

Only in recent years ______ begun to realize that wild dogs, kept within bounds, often do more good than harm.

A．people have

B．since people have

C．have people

D．people who have